When is week 1?
Week 1 of 2027: Jan 4 – Jan 10
Mon, Jan 4 – Sun, Jan 10, 2027
Week 1 of 2026 ended on Sunday, January 4, 2026, so this is next year's. It starts in 96 days.
Week 1 of 2027 day by day
Week 1 of 2027 falls in January, in Q1. Its Monday is day 4 of 2027. In US-style numbering (weeks starting on Sunday, week 1 containing January 1, like WEEKNUM in Excel) that Monday is in week 2.
| Day | Date | Holidays and observances |
|---|---|---|
| Monday | January 4, 2027 | — |
| Tuesday | January 5, 2027 | — |
| Wednesday | January 6, 2027 | Epiphany |
| Thursday | January 7, 2027 | — |
| Friday | January 8, 2027 | — |
| Saturday | January 9, 2027 | — |
| Sunday | January 10, 2027 | — |
Week 1 by year
More week numbers
Frequently asked questions
When is week 1 of 2027?
From Monday, January 4, 2027 to Sunday, January 10, 2027.
How many days until week 1?
96 days, counting from today to Monday, the first day of the week.
Why can week 1 start in December?
ISO week 1 is the week containing the year's first Thursday, so it can begin as early as December 29 of the previous year.